Cancel only one extruder while in Copy or Mirror mode

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You know the "Cancel" button that you can use while a print job is running? That's super handy if you see your print going south and just wanna kill it and start over. Problem is, what if you are in either Copy or Mirror. mode, and only one of the two sides/prints is failing? Do you cancel the print job or let it keep going, because one of them is printing fine?

Wouldn't it be awesome to be able to cancel only the side that is failing, and let the other side complete? I think that would effing rock!